Relative impedance measurement
US7848787B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2005 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Jul 26, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2034/2053
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for calibrating impedance includes coupling at least first, second, and third electrodes at respective locations to a surface of a body of a subject. A first current passing through the body between the first and second body-surface electrodes is measured, and a second current passing through the body between the first and third body-surface electrodes is measured. From the first and second currents, a contact factor is derived that is indicative of the impedance between at least one of the body-surface electrodes and the surface of the body. Also described are methods for sensing the position of a probe and for detecting tissue contact based on a relation between currents from the probe to body-surface electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.